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Federal Home Loan Bank Advances (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Jul. 01, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Federal Home Loan Bank Advances $ 1,300,000,000 $ 406,200,000  
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 5,500,000,000    
Remaining discount on Federal home loan bank advances 13,000 $ 92,000 $ 167,000
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]      
2018 557,501,000    
2019 356,000,000    
2020 272,627,000    
2021 133,750,000    
2022 0    
Thereafter 17,000    
Federal home loan bank advances, Total 1,319,895,000    
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]      
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available $ 4,300,000,000    
Weighted Average [Member]      
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]      
2018 1.46%    
2019 1.64%    
2020 1.74%    
2021 1.87%    
2022 0.00%    
Thereafter 2.75%    
Weighted average interest rate 1.61%